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Ultralight, packable dry bags to keep your gear organised and safe. 
Sea to Summit says:
An ultra-lightweight dry bag built in 30D siliconised CORDURA® nylon, our Ultra-Sil Dry Bag is an essential component of any fast and light adventure
Our Verdict
Theses are great if you like to keep your gear organised, a bag for food, clothes, sleeping bag etc. (though I prefer to keep my sleeping bag in a compression sack rather than a dry bag) they are also waterproof which make them excellent to store your electronics or a first aid kit.
- Reviewed by Ultralight Outdoor Gear
Features
- Waterproof, roll-top hypalon closure secured withour Field Repair Buckle for a reliable seal
 - Ultralight and super-strong, 30D diamond ripstop siliconised CORDURA® Nylon fabric has a 2000mm hydrostatic head
 - bluesign® APPROVED fabric with a C0 non-PFC DWR finish
 - Oval base prevents rolling and packs efficiently
 - Slippery finish slides into tight spaces
 
Specifications
3L Size -
- Weighs: 28g
 - Capacity: 3L
 - Dimensions : 20.7 x 17.1 x 14cm
 
5L Size -
- Weighs: 30g
 - Capacity: 5L
 - Dimensions : 30.8 x 17.1 x 15cm
 
8L Size -
- Weighs: 38g
 - Capacity: 8L
 - Dimensions : 36.8 x 19.1 x 17.2cm
 
13L Size -
- Weighs: 45g
 - Capacity: 13L
 - Dimensions : 43.3 x 22 x 19.6cm
 
20L Size -
- Weighs: 56g
 - Capacity: 20L
 - Dimensions : 47.3 x 26.9 x 23.6cm
 
35L Size -
- Weighs: 74g
 - Capacity: 35L
 - Dimensions : 56.5 x 32.1 x 28.5cm
 
Material & Construction
- 30D diamond ripstop siliconised CORDURA® Nylon fabric